Foreign fighters are massing in Pakistan’s lawless tribal areas as they prepare to launch attacks across the border on international troops in Afghanistan, according to an al-Qaeda member captured by Nato.

The Moroccan man, who was captured earlier this month, has told interrogators how he helped fighters enter Afghanistan.

“After his capture the facilitator provided details about his personal travel from Germany,” said a statement from the International Security Assistance Force.

“He also observed foreigners from many countries converging in Pakistan to conduct attacks against coalition forces in Afghanistan.” Ten insurgents died during the exchange of fire. Passports from France, Pakistan and Saudi Arabia were found among the bodies.